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Quick Answer: A batch controller flow meter system stops flow automatically when a preset volume or mass is reached. This eliminates manual measurement, reduces waste, and delivers repeatable batch fills. For plants filling drums, pails, or reactor vessels, this setup is the most cost-effective way to gain consistency without a full PLC.
Most batch controllers read pulse signals from a flow meter and open or close a valve based on the totalized count. You preset a target quantity. The controller counts pulses, compares the running total to the target, and triggers a relay when the batch is complete. Simple two-stage shutoff is common. A fast open valve does most of the fill, then a smaller valve or slower flow trims the last few liters. This avoids overshoot, even with high-speed pumps.
In practice, you wire the flow meter pulse output to the controller input, wire the relay to a solenoid valve or pump contactor, and set your batch size. That is the core loop. Add a 4-20 mA HART output if you want to log flow rate to a recorder or DCS, but the pulse path handles the batch logic.
Manual batching creates variation. One operator stops the pump a second late, another a second early, and each barrel shifts by half a liter. Multiply that by 500 barrels a day and you lose raw material and time. A batch controller removes that guesswork. It gives you the same shutdown point every time, within the repeatability of your flow meter.
Here is the thing. Many small and mid-sized plants in Southeast Asia, the Middle East, and Latin America do not want a full SCADA system just to fill drums. A batch controller paired with a reliable flow meter costs a fraction of a PLC cabinet. It installs in an hour. Operators push three buttons. That is often the real reason maintenance teams prefer this route.
Not every flow meter pairs well with a batch controller. The selection depends on liquid properties, pipe size, and the batch accuracy you need. Silver Automation Instruments supplies the sensor side of this pairing worldwide.
Oval Gear Flow Meters work well for viscous, non-conductive liquids like resin, diesel, edible oil, or paint. They output a high-resolution pulse per volume directly from mechanical rotation. On a DN25 oval gear meter with a flow range of 2 to 30 L/min, you can batch 20-liter pails with repeatability under 0.5 percent. A batch controller counts pulses cleanly because the signal is strong and does not need external excitation. For a lubricant blending plant in Vietnam, we supplied a Silver oval gear meter with a batch controller that fills 200-liter drums in under 70 seconds. The operator sets 200.0 liters, presses start, and walks away.
Coriolis Mass Flow Meters give you mass-based batching, not volume. This matters when temperature swings change liquid density. A chemical dosing room in Saudi Arabia uses our Silver Coriolis meter with a batch controller to charge 50 kg of solvent into a reactor. The controller counts pulse or mA values mapped to mass, and the final mass per batch stays within 0.2 percent of target regardless of a 15 deg C shift during the day. You get direct kilograms or tonnes on the display, not liters at reference temperature. If your recipe is in kg, skip the density conversion.
Electromagnetic Flow Meters suit water-based dosing in wastewater treatment and food processing. For a sodium hypochlorite dosing skid in a Philippine water plant, we paired a Silver magmeter with a batch controller. The meter outputs a frequency signal proportional to flow velocity. As long as conductivity stays above the minimum threshold (typically 5 microsiemens per cm), batch repeatability remains tight. Keep in mind that magmeters need a full pipe, so design your pipe run accordingly.
Vortex and turbine flow meters also work for clean, low-viscosity fluids where you need a cost-competitive inline solution. The pulse output connects directly to the batch controller. Most engineers skip this combination for sticky fluids because sensor fouling degrades repeatability over time.
When you select a batch controller, five parameters drive the decision. First, make sure it accepts the pulse frequency range and signal type from your flow meter: NPN, PNP, Namur, or reed switch. Second, check if it offers a two-stage valve control relay to avoid overshoot. Third, look for a PT100 input if you need temperature compensation for mass calculation. Fourth, look for at least one 4-20 mA output and Modbus RTU if you want to send data to a plant system. Finally, consider the enclosure rating. A front-panel IP65 controller works in washdown areas, which is common in food and beverage filling halls.
We have seen on customer sites many times that the missing piece is not the controller, but the flow meter that can deliver a clean pulse train at low flow cut-off. A batch is only as accurate as the pulses counted. That is why Silver Instruments focuses on meter-controller compatibility from the start.
A paint manufacturer in Indonesia asked us to help with their 20-liter pail filling line. They used a manual push-button that the operator timed by sight. Batch accuracy varied from 19.5 to 20.5 liters, and they had frequent spills. We recommended a Silver oval gear flow meter in DN20, flow range 3 to 35 L/min, with PNP pulse output, coupled to an SI batch controller with two-stage relay. The controller triggers a pneumatic ball valve for bulk fill, then a needle valve for dribble fill. Now each pail hits 20.0 liters, plus or minus 0.1 liter, at a rate of 4 pails per minute. The operator only selects the preset and presses start.
Because the paint has a viscosity around 2500 cP at 25 deg C, an oval gear meter was the natural pick. The batch controller display shows batch count and cumulative total, so the production supervisor checks daily output without a separate counter. This kind of detail matters when you are running three shifts and shipping to hardware stores across Java.
We do not sell just the controller or just the meter. We supply the matched pair, and we stand behind the accuracy. Our application team asks for your liquid type, viscosity in cP, flow range and pipe size (DN), batch size in liters or kg, and any hazardous area requirement like ATEX Zone 1. Then we propose the flow meter technology, the batch controller, and the valve recommendations that fit your site conditions.
Contact Silver Automation Instruments directly:
Email: [email protected]
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
From Thailand to Mexico, send us your pressure (bar), temperature (deg C), pipe size (DN), and flow range. We will provide a quote with a complete batch control bill of materials within one working day.
What is the difference between a batch controller and a flow totalizer?
A flow totalizer only sums flow and shows total volume. A batch controller compares the running total to a preset target and closes a valve automatically. It has at least one relay output and a start/stop logic. A totalizer does not take control action.
Can I batch by mass instead of volume?
Yes. Use a Coriolis mass flow meter with a batch controller that accepts mass pulses or configure the controller scaling to convert volume pulses into mass units. You need to know the density or use a meter that measures mass directly. Silver Coriolis meters output a mass-based pulse, so the controller displays kilograms without scaling tables.
What is the typical batch repeatability I can achieve?
With an oval gear meter and a properly tuned two-stage valve, repeatability around 0.2 to 0.5 percent of batch volume is realistic. For low-viscosity fluids with a magmeter or turbine, expect 0.5 to 1 percent. The valve response time and pipe layout have as much impact as the flow meter accuracy.
Do I need a PLC if I have a batch controller?
For simple fill operations, no. The batch controller handles preset management, relay output, and batch counting independently. If you need recipe handling across 20 different products with automatic valve manifold control, then a PLC makes sense. For 90 percent of drum and pail filling applications, a batch controller is sufficient.
Does Silver Instruments supply complete filling skids?
We supply the flow meter, batch controller, and can recommend valve and pump components. Many customers assemble the skid locally using our bill of materials. If you need a fully integrated skid, ask our sales team. We have partner workshops in several regions.
